I have the same problem with asus router gt-ax11000 (2xnude).
I got an answer from asus support regarding Firmware 184.108.40.206.388_22237
The FV 388 generation unfortunately contains a Mesh network bug and Asus is aware of this. We are currently working on firmware fixes for our devices to eliminate the problem you described. As a GT-AX11k user myself, I am looking forward to the fixes.
Unfortunately, due to the Chinese New Year, work on the fixes may be extended